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hometown
A supported fork of Mastodon that provides local posting and a wider range of content types.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I have a friend who is advocating for something called Neighborhoods. It's not exactly what you're talking about, but similar. https://github.com/hometown-fork/hometown/issues/1222
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.